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Title:
PRODUCTION METHOD FOR PRECARBONIZED FIBER BUNDLE, PRODUCTION METHOD FOR CARBON FIBER BUNDLE, AND PRECARBONIZATION FURNACE
Document Type and Number:
WIPO Patent Application WO/2021/193520
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing: a production method and a precarbonization furnace, which are for a precarbonized fiber bundle and which enable production of a precarbonized fiber bundle continuously over a long period of time by efficiently discharging, from an entire heat treatment chamber, a tar component-containing decomposition gas that is generated during precarbonization in production of carbon fibers and resides in the heat treatment chamber. This production method for a precarbonized fiber bundle comprises: precarbonizing one or more levels of aligned flameproofed fiber bundles by vertically arranging and horizontally moving, in the heat treatment chamber, the flameproofed fiber bundles, and subjecting the flameproofed fiber bundles to a heat treatment at a maximum temperature of 300-1,000°C using an inert gas supplied from the inlet side and outlet side of the heat treatment chamber. A flow rate ratio Q2/Q1 satisfies formula (1), where Q1 represents a gas volume flow rate of a first exhaust gas discharged out of the heat treatment chamber from a position higher than that of the flameproofed fiber bundle moving in the uppermost level, and Q2 represents a gas volume flow rate of a second exhaust gas discharged out of the heat treatment chamber from a position lower than that of the flameproofed fiber bundle moving in the uppermost level. Formula (1): 0.01 ≤ Q2/Q1 ≤ 0.5

Inventors:
HOSOTANI NAOTO (JP)
HIROSE TAKAMITSU (JP)
KATAOKA TAKUYA (JP)
Application Number:
PCT/JP2021/011679
Publication Date:
September 30, 2021
Filing Date:
March 22, 2021
Export Citation:
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Assignee:
TORAY INDUSTRIES (JP)
International Classes:
D01F9/32; D01F9/22; F27B9/04; F27D7/02
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